Pidentd
TCP/IP IDENT protocol server.

The pidentd package contains identd, which implements the
RFC 1413 identification server. Identd looks up specific TCP/IP
connections and returns either the user name or other information
about the process that owns the connection.

Identd can run stand-alone, or can be started by inetd
by adding the following line to
/etc/inetd.conf: